Shimano Ultegra R8050 Di2 front derailleur.

– Quick and smooth front shifting under high pedaling torque
– Programmed control of chain guide
– Shimano Synchronized shift
– Full and semi synchronized shifting program
– Redesigned to fit wider gear pitch without sacrificing shifting
– Shorter length of rear center (410mm) with O.L.D. 135mm
– System communication with rear derailleur, Programmed control of chainguide works for minimal chance of chain drop
– Top Gear Teeth: 46-53T
– Chain Stay Angle: 61-66
– Chain Line: 43.5
– Average Weight: 132 grams